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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871390f5841d5a50f1ea2b3234e8798a72c1e968ed7a8edf4bf5282e34af3428' 
  AND token = 'bCEZvrSWOv2iIqyn6YgIN4v2Xj0vFZcufNIlL6t1edI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}